In addition to a push-button lock, these pins have a cotter as a backup in case they start to slip out of place. Press the button to retract the retaining balls as you insert or remove.

Often used to position and hold parts during assembly and inspection, mate these pins with a receptacle to secure them in blind holes. Install the receptacle (sold separately) in the hole so you can insert the pin to join components. Three retaining balls lock pins in place until released.